Hi Edyvargas!
**First: **
I really think you should create individuals animations for what you are trying to do here. When this will be done, set your Running propellers animation to Clampforever mode (wrapMode). So when it will be played, it will loop the last frame "forever" until you say anything else.
Then, with 2 individuals animations for each alerons (going right and going left) I really think you do more specifics things!
Oh and read about this:
http://docs.unity3d.com/ScriptReference/Animation-wrapMode.html
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